The implementation of the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA) has transformed the procurement of carbon credits into a more significant strategic decision for airlines than just an environmental measure, particularly in the context of rising compliance obligations. The quality of a supplier directly influences compliance results, financial stability, and operational risk.
Selecting the best CORSIA supplier goes beyond simply opting for the cheapest credits. It is a matter of finding a supplier who can provide transparency in terms of documentation, eligibility verification, consistent market opportunity and assistance throughout the procurement process.
The challenge for airline finance and sustainability teams is to deliver compliant supply whilst keeping costs under control and mitigating regulatory risk.
This guide will detail how buyers can assess their suppliers, determine their credit eligibility and confidently acquire CORSIA credits.
Why CORSIA Eligibility Matters Before Buying Credits
One of the most frequent errors buyers make is assuming that all carbon credits will be eligible to meet aviation compliance requirements.
In reality, only certain CORSIA-eligible credits are eligible for use under the framework. Eligibility is based on the requirements set out by ICAO and its Technical Advisory Body (TAB) that reviews and grants approval to carbon crediting programs.
Approved programs include Verra’s VCS, Gold Standard, the American Carbon Registry (ACR), and others — but not every credit issued under these programs qualifies. Eligibility criteria vary according to methodology, vintage, and compliance period.
CORSIA is structured in three phases: a pilot phase (2021–2023), a first phase (2024–2026), and a second phase (2027–2035). Eligibility may change from one phase to another, and credits may be subject to more stringent requirements after 2027.
Suppliers can buy credits directly from CORSIA project developers, hold inventories across various programs, or arrange forward purchasing contracts, and, for CFOs working on a long-range carbon budget, that last capability matters most.
One of the best ways to assure price and eligibility risk in compliance periods is to engage suppliers early and to enter into forward contracting agreements.
Before closing a transaction, buyers should ensure that the credits they are purchasing are CORSIA-eligible emission units and meet the requirements for the relevant compliance period.
There are several risks involved when failing to verify eligibility:
- Shortfalls in compliance, necessitating late purchases.
- Replacement credit costs will exceed contracted prices in case of supply shortages.
- Reputational concerns with regulators and sustainability stakeholders
- Increased audit scrutiny during compliance reviews.
- Retroactive supply risk due to exclusion of a program from the approved list by ICAO.
Because replacement credits trade at a premium in a market with limited supply, late-stage buying creates a direct financial concern for CFOs. Organizations can mitigate this risk with a rigorous procurement strategy.
What Separates a Credible CORSIA Carbon Credits Supplier from a Credit Broker
Compliance expertise and commercial dependability are two factors for buyers to evaluate when assessing suppliers. A credible supplier of CORSIA carbon credits does much more than just lead a transaction; it also assists the buyer in verifying the documentation, evaluating the project quality, managing authorization requirements, and planning supply over compliance periods.
Assessment criteria:
Documentation and registry transparency
A responsible supplier will offer transparent documentation on the credit origin, registry information, the project type, issuance dates and eligibility status.
Buyers should be able to independently verify serial numbers and retirement status from recognized registries, which would ensure that the buyer does not buy retired or transferred credits.
Access to multiple project types and programs
The most reliable suppliers maintain relationships across multiple project categories, jurisdictions, and CORSIA offset providers, providing buyers with a degree of diversification to mitigate sourcing risk, including the risk associated with a particular project losing approval from ICAO between phases.
Market and regulatory knowledge
The carbon market is still under development, particularly with regards to the authorization criteria and the rules for eligibility post-2027. Suppliers should clearly and comprehensibly communicate these changes and how it will translate into actionable guidance for procurement.
Maintaining long-term supply and forward contracting capacity
Supply certainty beyond the compliance period is required by airlines to an increasing extent. Suppliers with the ability to support multi-year strategies, such as structured CORSIA offtake agreements, are worth much more than those that only deal in spot transactions. This is the commercial capability that is most directly driven to mitigate procurement risk for CFOs.
Pricing transparency and compliance support
Prices, transaction costs and settling periods should be clearly broken down and communicated to the suppliers. Some providers assist with wider CORSIA compliance services such as eligibility check reviews, retirement assistance and reporting support that can ease the internal resource load for finance and sustainability teams to work on.
Key Documents Buyers Should Check
Before purchasing CORSIA credits for sale, buyers should request and examine:
Registry records
Registry information should verify credit issuance status, serial numbers, project information, ownership and retirement status (if applicable).
Project documentation
When considering a specific project for purchase, the buyer should examine descriptions of the project, verification reports, and other project documentation to learn how the emissions reduction was achieved and verified.
Letter of Authorization CORSIA
The Letter of Authorization CORSIA plays a more significant role in certain transactions, where corresponding adjustments and Article 6 of the Paris Agreement considerations apply.
LoA requirements are not universal across all CORSIA transactions. They are applied specifically where a host country has endorsed the use of specific emissions reductions for international mitigation under Article 6, which is intended to prevent double counting between countries’ inventories. The requirement for an LoA will vary based on credit program, vintage, and compliance period in question.
At the procurement stage, buyers should make it clear:
- If the specific credits being purchased require authorization.
- Which authority issued the authorization
- Whether the authorization includes the applicable vintage and program
- How authorization relates to compliance needs for their specific fleet and time period
Getting clarity at an earlier stage means avoiding uncertainty with regard to legal and compliance at a later time, especially when ICAO is tightening up on the corresponding adjustment requirements after 2027.
Article 6 vs CORSIA: A Distinction That Matters for Procurement
The correlation between Article 6 and CORSIA needs to be explained to CFOs considering long-term carbon strategy.
Under Article 6 of the Paris Agreement, countries can share mitigation outcomes across countries (ITMOs — Internationally Transferred Mitigation Outcomes), with corresponding adjustments to ensure that the same emissions reductions are not counted in two national inventories at the same time.
At present, CORSIA does not mandate any corresponding adjustment for all eligible credits, but ICAO has indicated that the rule will change for the second phase (2027–2035).
When purchasing credits for long-dated compliance obligations, the airlines should request the supplier specifically to confirm that the credits offered are supported by the host country authorization and that they are designed to meet compliance requirements as they are amended.
How to Compare Top CORSIA Suppliers in 2026
When vetting options to choose the best CORSIA supplier in 2026, buyers need to pay attention to the objective criteria and not rankings or marketing claims.
Questions to consider:
- Can the supplier demonstrate credit eligibility for the specific compliance period?
- Does the supplier offer full registry documentation?
- Has the organization had aviation clients in the past?
- Does it have the capacity to sustain long-term procurement plans, such as forward contracting?
- Is there a clear pricing structure and reporting?
- Does it maintain relationships with multiple project developers and registries?
- Does it have a method for explaining relative positioning of its supply to anticipated changes in eligibility post 2027?
When looking at a CORSIA credit suppliers list, buyers should seek out suppliers that offer information that is supported by evidence and have high standards of transparency. Before signing a contract, buyers should also inquire:
- How are the criteria for credit eligibility checked for the relevant compliance period?
- Which registries are used, and can records be independently verified?
- Are Letters of Authorization available where required under Article 6 frameworks?
- What type of projects and programs does the supplier have in its portfolio?
- What support in terms of reporting and retirement is available after the purchase?
- How does the supplier track and respond to changes in the ICAO eligibility guidance?
How Econetix Supports Credible CORSIA Credit Sourcing
Econetix provides organizations access to verified carbon market solutions, with transparent documentation and procurement guidance, making it a clear choice for airlines looking to secure the best CORSIA supplier.
Econetix, as a supplier serving aviation and corporate buyers, focuses on ensuring that clients understand the eligibility requirements, whether they be program-level or vintage-specific; evaluate project portfolios; and navigate through complex compliance factors, including authorization documentation and registry verification.
From exploring a Verified Carbon Units (VCU) purchase, to evaluating opportunities related to Gold Standard credits eligible under ICAO-approved vintages, Econetix enables buyers to understand how to procure CORSIA credits in a structured manner with a focus on eligibility verification, documentation standards, and supply-chain transparency; including support for multi-year procurement planning as the market advances to the second compliance phase.
Conclusion
There is more to finding the best CORSIA supplier than just comparing credit prices. Suppliers should be assessed by the quality of their documentation, their eligibility verification procedures, market experience, and their ability to supply over the long-term.
A structured procurement process minimizes compliance risk, ensures budgeting predictability and boosts supply-chain integrity. Buyers can source CORSIA credits with increased confidence by reviewing the registry records, checking the eligibility of the applicable CORSIA phase, understanding the authorization obligations, and collaborating with credible suppliers like Econetix.
Frequently Asked Questions (FAQs)
How should a CFO benchmark CORSIA suppliers beyond price?
The ideal CORSIA supplier has to be evaluated based on registry transparency, eligibility verification standards, and forward supply capacity; price alone does not represent compliance or replacement-cost risk.
Are all carbon credits eligible under CORSIA?
No, only credits that are compliant with the ICAO-approved program, methodology, and vintage criteria qualify and may be different for each phase of compliance.
Why is a Letter of Authorization important?
It provides confirmation of host country authorization of emissions reductions under Article 6 mechanisms, reducing double counting risk.
How can buyers verify CORSIA eligibility?
Verify registry records, project documentation, ICAO program eligibility list, and authorization documents before purchase.
How can Econetix help with CORSIA credit sourcing?
Econetix assists buyers in the eligibility verification, registry documentation, and multi-year procurement planning throughout the CORSIA compliance period.
